Mapping abstract values to visual representations is what data visualization is all about, and that’s exactly what D3 scales do. Turning a test score into a column height, or a percentage into an opacity requires translating from one set of possible…

Mapping abstract values to visual representations is what data visualization is all about, and that’s exactly what D3 scales do. This is usually done using pretty straightforward algorithms, but nothing is straightforward when you’re working with Dat…

Sometimes data needs to be converted from a continuous range, like test scores, to a discrete set of output values, like letter grades. In this lesson we’ll see how to use d3.scaleQuantize() to do exactly that. function scaleQuantize(){ var quantizeS…

1 I've found some libraries which decode input from transaction, but all of them require ABI of contract. Can I decode input data if I know only txHash, contract address and input data? How etherscan does it? Here is an example:https://etherscan.io/t…

公司今年计划大批扩建门店,需要自动化维护相关主数据,其中就有一步通过调用 WB01的BDC录屏来自动创建地点,前台跑没有问题,但后台JOB死活不行,屏幕是以前同事录好的,只能硬着头皮修改. 后台任务日志:  抛RAISE_EXCEPTION异常. 用ST22进去跟踪出错的代码: 出错的地方: 结合前台调式,发现了出错屏幕: 即SAPLPLANT_DISPLAY_CUSTOMIZING的1000屏幕出问题,经查证原因是屏幕上的ALV是OO方式写的 解决办法:后台时跳过该屏幕,但处理逻辑不能省.由于…

Sqoop Export数据到本地数据库时出现错误,命令如下: sqoop export \ --connect 'jdbc:mysql://202.193.60.117/dataweb?useUnicode=true&characterEncoding=utf-8' \ --username root \ --password-file /user/hadoop/.password \ --table user_info_copy \ --export-dir /user/hadoop/use…

本节内容非常重要,如果你不能很好的掌握本节内容,你无法真正理解比特币的运行原理,请务必要学习清楚. 比特币的交易模型为UTXO(unspend transaction output),即只记录未花费的比特币输出,每次交易花费的是之前的某一个或多个输出. 什么是UTXO? 以下借用一下网上的图 我们在现实世界中的支付系统是基于账户模型的,也就是说每一个人都有一个账户,支付就是在不同的账户中加加减减,类似如下: UTXO的实现,图示如下: 从上面的图中可以看出,比特币存储的实际是一笔又一笔的交易,最…

一.部署 Django 到远程 Linux 服务器 利用 xshell 通过 ssh 连接到 Linux服务器,常规的启动命令是 python3 manage.py runserver 但是,关闭 xshell 后,就访问不了 Django 了. 这时候需要使用 nohup 命令启动(概念:如果你正在运行一个进程,而且你觉得在退出帐户时该进程还不会结束,那么可以使用nohup命令.该命令可以在你退出帐户/关闭终端之后继续运行相应的进程) 这时输入 nohup python3 manage.py…

When your data contains discrete, non-numeric property values that you need to format or convert before displaying, d3.scaleOrdinal() is the API you need. Maybe you need to convert a “pass”/”fail” field to “green”/”red” for coloring your bubble chart…

http://www.cs.indiana.edu/~geobrown/book.pdf An example of a basic timer is illustrated in Figure 10.1. This timer has four components – a controller, a prescaler (PSC), an “auto-reload” register (ARR) and a counter (CNT). The function of the prescal…